Why is it that Pakistan has only a few things to redeem in Microsoft Rewards?

I would not expect anything meaningful to be added to the Pakistan rewards program, but you're free to contact Microsoft Rewards support and see if that may be changing

Since Pakistan is not a supported region for Xbox, they wouldn't have Xbox gift cards to give out.

Do I take it you mean that you want to redeem a specific reward but it is currently not available to be redeemed? If that is the case, then it depends on the reward and why it isn't available...could be that the stock of the reward has run out, could be it has been temporarily removed for a specific reason. I have know Rewards to disappear for a few months then reappear, others to disappear for a few hours

Hello, My name is Jesse. I'm an Independent Advisor and a member of the Microsoft community and I'd love to assist you today.

Unfortunately until if is in Pakistan, you can't redeem things using your points. Usually the reason why Xbox Live services are not available in a country/region is due to Government policy and restrictions that doesn't favour Microsoft. Hopefully things changes soon

Since the Microsoft Rewards program is not available in Pakistan, then you would not be able to use it.